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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/roundtrip/008.xhtml 

<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Drag and drop roundtrip with text/uri-list data</title>
<style type="text/css">
div[ondragenter]
  {width:40px;
  min-height:40px;
  margin-top:20px;
  padding:40px;
  color:white;
  background-color:navy;}
</style>
</head>
<body>
<div
  draggable="true"
  ondragstart="event.dataTransfer.effectAllowed = 'copy';event.dataTransfer.setData('text/uri-list','data:text/plain,PASS')"
  ondragenter="event.preventDefault()"
  ondragover="return false"
  ondrop="document.querySelector('div').appendChild(document.createTextNode(event.dataTransfer.getData('text/uri-list').substr(16,4) + ' '))"
/>
<p>Drag blue box outside browser window and then drag it back and drop on itself. You should see word PASS once you drop it.</p>
</body>
</html>